MODIFICATION OF DEVELOPMENT ON THE BASIS OF DIFFERENTIAL SUSCEPTIBILITY TO RADIATION

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Abstract
Further experiments are reported on the differential modification of development in Arbacia by radiation. In this series, eggs or sperm were exposed before fertilization to ultraviolet or to visible radiation following sensitization with eosin, benzoflavine, neutral red, or methylene blue. With either type results are similar, varying only in degree; ultra-violet radiation requires a shorter exposure to produce a given effect than does visible radiation following sensitization. The resulting larvae developing from a zygote, either component of which has been exposed to radiation, may show evidences of permanent inhibition of development, or of temporary inhibition followed by recovery, or acclimation. In any event, the most active regions of the developing egg are most readily modified in their development. Consequently the inhibition of median anterior regions results in the production of narrow-angled, short-armed larvae with underdeveloped oral lobes. In cases in which the injury to the developing egg has been slight or transitory, permitting acclimation or recovery, the larvae have overdeveloped oral lobes, and are wide-angled and long-armed. Further evidence is also presented for early differences in the susceptibility of the various regions of the egg to the injurious action of radiation directly applied, or to the deleterious effect of fertilization of normal eggs with radiated sperm.

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